Kingdom Protoctista includes_______________?

Related Mcqs:

1. Which D.C. motor will be preferred for machine tools ?

   A. Series motor
   B. Shunt motor
   C. Cumulative compound motor
   D. Differential compound motor

2. In D.C. shunt motors as load is reduced__________________?

   A. the speed will increase abruptly
   B. the speed will increase in proportion to reduction in load
   C. the speed will remain almost/constant
   D. the speed will reduce

3. These days D.C. motors are widely used in____________?

   A. pumping sets
   B. air compressors
   C. electric traction
   D. machine shops

4. The current drawn by the armature of D.C. motor is directly proportional to__________?

   A. the torque required
   B. the speed of the motor
   C. the voltage across the terminals
   D. none of the above

5. For the same H.P. rating and full load speed, following motor has poor starting torque_____________?

   A. shunt
   B. series
   C. differentially compounded
   D. cumulativelyc’ompounded

6. Sparking, is discouraged in a D.C. motor because_____________?

   A. it increases the input power con-sumption
   B. commutator gets damaged
   C. both A. and B.
   D. none of the above

7. The armature voltage control of D.C. motor provides_____________?

   A. constant voltage drive
   B. constant current drive
   C. constant torque drive
   D. none of the above

8. Regenerative method of braking is based on that___________?

   A. back e.m.f. is less than the applied voltage
   B. back e.m.f. is equal to the applied voltage
   C. back e.m.f. of rotor is more than the applied voltage
   D. none of the above

9. For which types of D.C. motor, dynamic braking is generally used ?

   A. Shunt motors
   B. Series motors
   C. Compound motors
   D. All of the above

10. In which of the following device the generated emf and armature current are in the opposite directions?

    A. dc generator
    B. dc motor
    C. transformer
    D. all of the above